TM 5-3895-370-14&P
5-36. STARTER REPAIR (CONT).
c. Testing.
(1)
Check armature for short circuits, opens, and grounds as follows:
(a)
Short circuits. Short circuits are located by rotating armature in growler with steel strip held on armature.
Steel strip will vibrate on area of short circuit. Shorts between bars are sometimes produced by brush dust
or copper between bars.
(b)
Opens. Check points where conductors are joined to commutator for loose connections causing arcing and
burning of commutator. If bars are not badly burned, leads to riser bars can be resoldered.
(c)
Grounds. Grounds in armature can be detected by use of test lamp. If lamp lights when one test prod is
placed on commutator and other test prod on armature core or shaft, armature is grounded.
(2)
Check field coil for grounds and opens as follows:
NOTE
Ground check cannot be made if ground connection cannot be disconnected.
(a)
Grounds. Disconnect field coil ground connection. Using test lamp, connect one test prod to field frame
and other to field connector. If lamp lights, field coils are grounded and must be repaired or replaced.
(b)
Opens. Connect test lamp prods to ends of field coils. If lamp does not light, field coils are open.
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